Machine



(No Model.) 2 Sheets-Sheet 1.

P. H. ABBOTT. SAW GUMMING MACHINE.

No. 444,870. Patented Jan. 20, 189 1.

Witnesses 2 Sheets'Sheet 2.

(No Model.)

I. H. ABBOTT. SAW GUMMING MACHINE.

Patented Jan. 20

2/91} in ewes UNITED STATES PATENT OFFICE.

FRANCIS H. ABBOTT, OF CHRISNEY, INDIANA, ASSIGNOR OF ONE-HALF TO MARTIN A. ABBOTT, OF SAME PLACE.

SAW-GUMMING MACHINE.

SPECIFICATION forming part of Letters Patent No. 444,870, dated January 20, 1891.

Application filed April 10, 1890. Serial No. 347,369- (No model.)

ing at Chrisney, in the county of Spencer and State of Indiana, have invented certain new and useful Improvements in SaW-Gumming Machines; and I do hereby declare the follow- I ing to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanymg drawings, and to letters of ref- I erence marked thereon, which form a part of this specification.

My invention relates to certain new and useful improvements in saw-gummers; and it. consists in the improved construction, hereinafter described and set forth, whereby novel devices are provided for suspending the feed of the cutter at a predetermined adjustment, and also in a novel arrangement of castings for providing the frame and clamps and the cutter-frame and its bearings, together with the necessary shafts, gearing, and feed mechanism.

In the accompanying drawings, Figure 1 is a perspective view showing the gummer in position to be attached to a saw. Figs. 2 and 3 are side view s. Fig. l is an end View, and Fig. 5 is an isometrical detail sectional View taken on the line x to of Fig. 4 and looking in the direction of the arrow. Fig. 6 is a detail view of the catch.

A refers to-a ring-fran'ie, the central opening therein having a flange a, to which the frame 13 is adj ustably secured, so that it can be turned within the ring-frame and secured thereto in any desired position. This ringframe has formed integral therewith laterallyprojecting lugs, a space being provided beneath the ends of the same, within which the saw will lie, and the ends of these lugs A have clamp-screws which bear upon the saw and secure the ring-frame thereto. Openings are also provided for the reception of arms 0, which are adjustable within the openings and have on their inner ends eyes, through which pass in one in stance a screw-threaded bar havinga locking-nut and in the other a plainheaded pin, the end of which is notched. This notched pin is held in place by a set-screw at the other.

and is adapted to impinge against the saw, so as to lie on the edge and side thereof. This pin and bar serve as gages, so that each tooth will be gu m med or cut away to the same extent.

The frame B, which bisects the ring A, consists of a plate, which is made of a single piece and is provided with a slot, one of the ends thereof being enlarged, and through this enlarged end the sliding frame is placed before the plateBis secured to the ring-frame. This plate 13 has a screw-threaded offset B formed on what is normally its lower end, and through the same passes a screw-threaded shaft having aworrn-wheel at one end and a hand-Wheel Curved plates 13 having inwardly-bent ends and screw-threaded openings, are attached to the plate B by thumbscrews, an d when said th u mb-screws are tightened the frame B is securely clamped against the flange a of the ring-frame A, and by loosening the thumb-screws this plate B may be adjusted at any desired angle within the ringframe.

O refers to a casting or supporting-frame made up of a single piece, which has recesses c at one end, within which lie the edges of the frame B, the opposite end from these recesses of the casting 0 being supported and held in place by the end of the screw-threaded rod d, adjacent to which the worm-wheel e is at tached. This screw-threaded rod (1 has a circumferential recess and is held within its hearing by an intersecting pin 0. One of the projecting ends ofthe casting C is formed with a, rectangular bend (3 therein, in which is a bearing for the main shaft E, having at each endcrank-handles for turning the same. This main shaft also passes through a bearing in the central portion 0 of the casting O. Upon this shaft, between the center portion and depending portion C of the casting, is keyed a gear wheel j, which meshes with a gear-wheel F, secu red to a movable countershaft g, supported in the lower bearing of the portion 0 of the casting O. The outer end of this shaft is headed, and within the head is located a spiral spring g, said spring having a tendency to throw the shaft and gear-wheel carried thereby outwardly. The inner face too of the gear-wheel F has a spiral, which engages with a worm -wheel e on the screwthreaded shaft (Z, so that when the crank-handles are turned said worm-wheel will be rotated to automatically feed the cutter Gr, located upon the main shaft, against the base of the tooth of the saw, and when the proper depth has been reached by the cutter a latch II, which is bent and pivoted to the casting C, as shown, will abut against an adjustable arm I, attached to the frame B, so as to throw the latch upwardly and allow the gear-wheel F and shaft to be moved to one side by the spring, and thus be placed out of engagement with the worm-wheel e. The latch II is pivoted to the casting C by a screw 7L and its end bent at right angles an d slightly curved to lie between the arbor or bearing of the shaft g and the hub of the gear-wheel F, and the operating means or bar I consists of a slotted plate 1', having a projecting portion i, as shown, which, when properly adjusted, will be in the path of the latch as the casting moves. The casting C carries a gravity-pawl J, which engages with the gear-teeth of the wheel F and prevents backward rotation of the operating and cutting mechanism.

To gum a saw or recutthe base of the teeth the machine is placed upon the saw, so that the teeth thereof will lie in the slots or recesses formed integral with the ring-frame, and the arms 0 are properly adjusted,as well as the gages carried thereby, the casting C first having been moved adjacent to the upper portion of the ring-frame by turning the hand-wheel located on the screw-threaded bar. The latch is then placed to hold the spiral on the wheel F in engagement with the wormwheel 6, and by turning the main shaft with the crank-arms the teeth of the saw will be cut, and after being cut sufficiently the latch engages with the stop mechanism and the automatic feed ceases.

It will be noted that the apparatus can be set upon the saw to cut the teeth at any desired angle.

Having thus described my invention, I claim 1. In a saw-gummer, the combination, with the movable tool-slide and its feeding-screw provided with a worm-wheel, of a cutter-shaft and springretracted counter shaft, both mounted in the tool-slide and having intermeshing gear-wheels, a spiral rib on the counter-shaft gear-W11 eel to engage and actuate the worm-wheel, together with a pivoted catch to retain the countershaft and hold said rib in engagement with the worm-wheel, and an adjustable stop-plate designed to trip the catch when the slide reaches the limit of a predetermined feed, substantially as set forth.

2. In a saw-gummer, the combination, with the ring-plate having the inner circular flange and outer clamp projections all in one piece, of the circumferentially-adj ustable plate carrying the movable tool'slide, the latter comprising in a single piece the central portion C and outer bearing-arm C O, together with clamp screws, cutter, and counter-shafts, gearing and feed mechanism, substantially as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

FRANCIS H. ABBOTT. Witnesses:

GEORGE A. SMITH, DAVID J. SMITH. 

